Heavy Hex Bolts | McMaster-Carr

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677 Products

About Hex Head Screws and Bolts

18-8 Stainless Steel Heavy Hex Head
Screws for High-Pressure Applications

These Grade B8 screws are made from 18-8 stainless steel and have good chemical resistance. Also known as pressure bolts, they meet the high-pressure and high-temperature regulations of ASTM A193 and are used to secure pressure tanks, valves, and flanges.

Super-Corrosion-Resistant 316
Stainless Steel Heavy Hex Head
Screws for High-Pressure Applications

Made from 316 stainless steel, these Grade B8M screws are more corrosion resistant than 18-8 stainless steel screws. Also known as pressure bolts, these screws meet the high-pressure and high-temperature regulations of ASTM A193.

Steel Heavy Hex Head Screws
for High-Pressure Applications

Made of Grade B7 steel, these screws are nearly twice as strong as Grade B8 and Grade B8M stainless steel screws. Also known as pressure bolts, they meet the high-pressure and high-temperature regulations of ASTM A193 and are used to secure pressure tanks, valves, and flanges.

Steel Heavy Hex Head Screws
for Low-Temperature Applications

Made from Grade L7 steel, these screws don’t become brittle in the cold, so they stand up to impact even at temperatures as low as -150° F.

Medium-Strength Steel Heavy Hex
Head Screws for Structural Applications

The most common heavy hex head screw, these steel screws meet ASTM A325 regulations for structural joints, such as mating I-beams and scaffolding.

Metric High-Strength Steel Heavy Hex
Head Screws for Structural Applications

Designed for construction and exterior building applications, these metric screws are often used to join I-beams and scaffolding. Their partial threading leaves an unthreaded portion that is strong enough to stand up to the sideways forces of joints.

High-Strength Steel Heavy Hex Head
Screws for Structural Applications

50% stronger than our medium-strength steel heavy hex head screws, these screws meet ASTM A490 specifications for structural applications. Use them in joints that require more tensile strength than ASTM A325 screws.

About Hex Head Screws and Bolts

Heavy Hex Head Screws

18-8 Stainless Steel Heavy Hex HeadScrews for High-Pressure Applications

Super-Corrosion-Resistant 316Stainless Steel Heavy Hex Head Screws for High-Pressure Applications

Steel Heavy Hex Head Screwsfor High-Pressure Applications

Steel Heavy Hex Head Screwsfor Low-Temperature Applications

Medium-Strength Steel Heavy HexHead Screws for Structural Applications

Metric High-Strength Steel Heavy HexHead Screws for Structural Applications

High-Strength Steel Heavy Hex HeadScrews for Structural Applications

18-8 Stainless Steel Heavy Hex Head
Screws for High-Pressure Applications

Super-Corrosion-Resistant 316
Stainless Steel Heavy Hex Head
Screws for High-Pressure Applications

Steel Heavy Hex Head Screws
for High-Pressure Applications

Steel Heavy Hex Head Screws
for Low-Temperature Applications

Medium-Strength Steel Heavy Hex
Head Screws for Structural Applications

Metric High-Strength Steel Heavy Hex
Head Screws for Structural Applications

High-Strength Steel Heavy Hex Head
Screws for Structural Applications